Word Origin & History
arrearsearly 14c., from O.Fr. ariere "behind, backward," from V.L. *ad retro, from L. ad "to" + retro "behind." Meaning "balance due" dates from mid-15c.; phrase in arrears first recorded 1620, but in arrearages is from late 14c.
arrearmid-14c., "in times past;" see
arrears. Meaning "behind in duties or payments" is from 1620s.